Trek Facts - The Klingon Civil War

[Nutso]

[00111010 01000100]

But the question remains.... was it really “Civil”?

[RK_Striker_JK_5]

But the question remains.... was it really “Civil”?

Well, for Klingons, it was probably positively polite!

[Coalition]

But the question remains.... was it really “Civil”?

Actually yes
https://memory-alpha.fandom.com/wiki/Redemption_II_(episode)

Act one, second paragraph:

Meanwhile, Worf and Kurn celebrate the war by drinking with a number of Klingons, many of whom support the House of Duras. Worf arrives and Kurn introduces him to Captain Larg, who commanded the squadron that tried to destroy them the day before. Larg insults Worf by implying that Worf isn't worthy of wearing a Klingon uniform. Worf is incensed and tries to attack Larg but Kurn restrains him, telling him that the capital city is neutral ground and that Larg's men are all around them, as are Kurn's. Kurn and Larg then both pick up a glass of bloodwine and tell each other to die well, then throw the glasses away and then Larg leaves. Worf asks Kurn if he really is drinking with their enemies. Kurn ask him how many of these warriors are with them and how many with the Duras family. Kurn tells them when they meet in battle they will fight to the death but here in the capital city they are all Klingons, all warriors. Worf starts to give Kurn a status report on the repair of the Hegh'ta's stabilizers but Kurn asks him if only duty is in his heart then tells him that they all have duties and responsibilities but at the same time he reminds Worf that they are all Klingons, all warriors, fighting in a glorious war. Kurn asks Worf to contemplate the fact that they will fight battles soon that others can only dream of and it is time to celebrate, for tomorrow they all may die. Kurn asks Worf to forget the status report and go with him and let them live the night together as if it were their last. Worf agrees and goes into the group of Klingons with Kurn.

Even when both sides just came from trying to kill each other, and will try to kill each other the next day, they gather in the bar, get drunk together, and wish each other a good death.

[McAvoy]

Ehh just Klingons being Klingons. Their Civil War was just an excuse to kill things.